An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO₂ Hollow Microspheres

Abstract

Transition metal oxides (TMO) are promising candidates for low-cost and high-efficiency catalysts for the hydrogen evolution reaction (HER). However, the low conductivity and severe agglomeration of catalyst particles hinder their practical application. Herein, we report an effective HER electrocatalyst of 3D-rGO-CeO 2 with three-dimensional reduced graphene oxide (3D-rGO) decorated with CeO 2 hollow microspheres through a hydrothermal self-assembly approach. It is shown that the CeO 2 hollow microspheres with an average size of ca. 680 nm are uniformly encapsulated within the porous structure of 3D-rGO. Compared with bare CeO 2 hollow micro- [a]

Recent Advances of CeO2‐Based Electrocatalysts for Oxygen and Hydrogen Evolution as well as Nitrogen Reduction

“…Three-dimensional reduced graphene oxide has also been selected as support to decorate CeO 2 hollow microspheres on it to fabricate hybrid 3D-rGOÀ CeO 2 composite as electrocatalyst for HER with a η 10 of 0.34 V and a Tafel slope of 112.8 mV • dec À 1 . [122] Sheng et al prepared CoÀ W/CeO 2 composite coatings on copper substrates by electrodeposition and studied the effects of micro-CeO 2 particles at different concentrations on the composition, structure and morphology of composite coatings. [123] The CeO 2 incorporation improved the crystallinity of the CoÀ W alloy and made more compact coating with fewer microcracks and defects.…”

“…At the current density of 10 mA/cm 2 , the overpotential of Co−CeO 2 @CNF is only 92 mV, much lower than that of Co@CNF (270 mV) and CeO 2 @CNF (381 mV), and the slope of Tafel is 54 mV/dec. Three‐dimensional reduced graphene oxide has also been selected as support to decorate CeO 2 hollow microspheres on it to fabricate hybrid 3D‐rGO−CeO 2 composite as electrocatalyst for HER with a η 10 of 0.34 V and a Tafel slope of 112.8 mV ⋅ dec −1 [122] . Sheng et al prepared Co−W/CeO 2 composite coatings on copper substrates by electrodeposition and studied the effects of micro‐CeO 2 particles at different concentrations on the composition, structure and morphology of composite coatings [123] .…”

Electrochemical Performance Evaluation of Bimetallic Sulfide Nanocomposite with Fullerene (CeNdS/C60) for Efficient Oxygen Evolution Reaction (OER)

“…C 1s spectra are deconvoluted into two peaks at BE values of ∼285 and 288.5 eV. The peak at 285 eV is accredited due to the direct bonding of C–C atoms, and the peak at 288.5 eV is related to the CC group. − Such bonds in the C 1s spectrum confirmed the existence of C 60 . Several active bonding states result from the doping effect and bonding of more electronegative ions in a catalyst sample.…”

Amorphous Co‐P Film: an Efficient Electrocatalyst for Hydrogen Evolution Reaction in Alkaline Seawater

“…Water splitting offers an attractive carbon-neutral technique for large-scale high purity hydrogen production, and considerable recent effort has been made to developing highly efficient hydrogen evolution reaction (HER) electrocatalysts in freshwater. [4][5][6][7][8][9][10][11] However, large amounts of freshwater electrolysis would put enormous pressure on limited freshwater resources. [12][13] Seawater, as the most abundant water resources on earth (~96.5 %), is an endless resource with a great potential for hydrogen generation.…”

“…Hydrogen (H 2 ) is an desired energy carrier due to its high energy density and carbon‐free emission. Water splitting offers an attractive carbon‐neutral technique for large‐scale high purity hydrogen production, and considerable recent effort has been made to developing highly efficient hydrogen evolution reaction (HER) electrocatalysts in freshwater [4–11] . However, large amounts of freshwater electrolysis would put enormous pressure on limited freshwater resources [12–13] .…”